The novels center on a bar called "Nobu" — located in Kyoto, Japan, but with a door that is connected to the bar in another world. The visitors include denizens of the other world, and customers seek out its excellent "Toriaezu Nama" ale and cuisine.
 
(Source: Anime News Network)

Izakaya “Nobu” is a modest establishment, staffed by only two people: master, Nobuyuki Yazawa, and server, Shinobu Senke. 
 
Despite its humble appearance, its entrance is mysteriously connected to an ancient city from another world: “Aitheria.” Nobu’s patrons consist of lazy palace guards, incognito clergymen, and the Waterworks Guildmaster – certainly not your average clientele! 
 
But once they enter Nobu’s doors, they are greeted with the finest alcohol they’ve ever tasted and dishes the likes of which they’ve never seen. With the food plentiful and the drinks flowing, the patrons leave their troubles at the door as they call, “Give me a cold ale, master!” 
 
(Source: Crunchyroll)

"There's this pub (Izakaya) that was supposed to be in a certain place in Kanto region of Japan called “Gen”. 
After opening the door one day, it was found to be connected to the city of Parisia, the Kingdom of the Eastern Kingdom… 
Individual residents from a foreign world such as fallen monks, warriors, noble female knight, daughters of noisy famous aristocrats, etc. all visited the peculiar izakaya which they've never seen before, and gradually they'll become fans of the dishes… 
A foreign world gourmet fantasy has finally started!"

A Japanese style pub called "Nobu" exists in a back alley of the fictional medieval European city of Eiteriach. Its customers? A pair of slacker soldiers, a spoiled heiress, an uptight tax collector, and more... When the citizens of this strange world sit down to enjoy some unfamiliar Japanese cuisine, their troubles simply melt away...
 
(Source: Udon Entertainment)

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